mirror of
https://github.com/home-assistant/core
synced 2024-08-28 03:36:46 +02:00
628 lines
26 KiB
Python
628 lines
26 KiB
Python
"""Provides the worker thread needed for processing streams."""
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from __future__ import annotations
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from collections import defaultdict, deque
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from collections.abc import Callable, Generator, Iterator, Mapping
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import contextlib
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from dataclasses import fields
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import datetime
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from io import SEEK_END, BytesIO
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import logging
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from threading import Event
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from typing import Any, Self, cast
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import av
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from homeassistant.core import HomeAssistant
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from homeassistant.util import dt as dt_util
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from . import redact_credentials
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from .const import (
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AUDIO_CODECS,
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HLS_PROVIDER,
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MAX_MISSING_DTS,
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MAX_TIMESTAMP_GAP,
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PACKETS_TO_WAIT_FOR_AUDIO,
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SEGMENT_CONTAINER_FORMAT,
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SOURCE_TIMEOUT,
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)
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from .core import (
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STREAM_SETTINGS_NON_LL_HLS,
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KeyFrameConverter,
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Part,
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Segment,
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StreamOutput,
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StreamSettings,
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)
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from .diagnostics import Diagnostics
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from .fmp4utils import read_init
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from .hls import HlsStreamOutput
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_LOGGER = logging.getLogger(__name__)
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NEGATIVE_INF = float("-inf")
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class StreamWorkerError(Exception):
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"""An exception thrown while processing a stream."""
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class StreamEndedError(StreamWorkerError):
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"""Raised when the stream is complete, exposed for facilitating testing."""
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class StreamState:
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"""Responsible for trakcing output and playback state for a stream.
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Holds state used for playback to interpret a decoded stream. A source stream
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may be reset (e.g. reconnecting to an rtsp stream) and this object tracks
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the state to inform the player.
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"""
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def __init__(
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self,
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hass: HomeAssistant,
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outputs_callback: Callable[[], Mapping[str, StreamOutput]],
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diagnostics: Diagnostics,
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) -> None:
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"""Initialize StreamState."""
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self._stream_id: int = 0
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self.hass = hass
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self._outputs_callback: Callable[
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[], Mapping[str, StreamOutput]
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] = outputs_callback
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# sequence gets incremented before the first segment so the first segment
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# has a sequence number of 0.
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self._sequence = -1
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self._diagnostics = diagnostics
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@property
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def sequence(self) -> int:
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"""Return the current sequence for the latest segment."""
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return self._sequence
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def next_sequence(self) -> int:
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"""Increment the sequence number."""
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self._sequence += 1
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return self._sequence
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@property
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def stream_id(self) -> int:
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"""Return the readonly stream_id attribute."""
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return self._stream_id
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def discontinuity(self) -> None:
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"""Mark the stream as having been restarted."""
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# Preserving sequence and stream_id here keep the HLS playlist logic
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# simple to check for discontinuity at output time, and to determine
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# the discontinuity sequence number.
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self._stream_id += 1
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# Call discontinuity to fix incomplete segment in HLS output
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if hls_output := self._outputs_callback().get(HLS_PROVIDER):
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cast(HlsStreamOutput, hls_output).discontinuity()
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@property
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def outputs(self) -> list[StreamOutput]:
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"""Return the active stream outputs."""
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return list(self._outputs_callback().values())
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@property
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def diagnostics(self) -> Diagnostics:
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"""Return diagnostics object."""
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return self._diagnostics
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class StreamMuxer:
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"""StreamMuxer re-packages video/audio packets for output."""
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def __init__(
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self,
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hass: HomeAssistant,
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video_stream: av.video.VideoStream,
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audio_stream: av.audio.stream.AudioStream | None,
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audio_bsf: av.BitStreamFilter | None,
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stream_state: StreamState,
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stream_settings: StreamSettings,
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) -> None:
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"""Initialize StreamMuxer."""
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self._hass = hass
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self._segment_start_dts: int = cast(int, None)
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self._memory_file: BytesIO = cast(BytesIO, None)
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self._av_output: av.container.OutputContainer = None
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self._input_video_stream: av.video.VideoStream = video_stream
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self._input_audio_stream: av.audio.stream.AudioStream | None = audio_stream
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self._audio_bsf = audio_bsf
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self._audio_bsf_context: av.BitStreamFilterContext = None
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self._output_video_stream: av.video.VideoStream = None
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self._output_audio_stream: av.audio.stream.AudioStream | None = None
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self._segment: Segment | None = None
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# the following 3 member variables are used for Part formation
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self._memory_file_pos: int = cast(int, None)
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self._part_start_dts: int = cast(int, None)
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self._part_has_keyframe = False
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self._stream_settings = stream_settings
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self._stream_state = stream_state
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self._start_time = dt_util.utcnow()
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def make_new_av(
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self,
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memory_file: BytesIO,
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sequence: int,
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input_vstream: av.video.VideoStream,
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input_astream: av.audio.stream.AudioStream | None,
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) -> tuple[
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av.container.OutputContainer,
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av.video.VideoStream,
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av.audio.stream.AudioStream | None,
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]:
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"""Make a new av OutputContainer and add output streams."""
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container = av.open(
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memory_file,
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mode="w",
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format=SEGMENT_CONTAINER_FORMAT,
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container_options={
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**{
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# Removed skip_sidx - see:
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# https://github.com/home-assistant/core/pull/39970
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# "cmaf" flag replaces several of the movflags used,
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# but too recent to use for now
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"movflags": "frag_custom+empty_moov+default_base_moof+frag_discont+negative_cts_offsets+skip_trailer+delay_moov",
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# Sometimes the first segment begins with negative timestamps,
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# and this setting just
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# adjusts the timestamps in the output from that segment to start
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# from 0. Helps from having to make some adjustments
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# in test_durations
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"avoid_negative_ts": "make_non_negative",
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"fragment_index": str(sequence + 1),
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"video_track_timescale": str(int(1 / input_vstream.time_base)),
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},
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# Only do extra fragmenting if we are using ll_hls
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# Let ffmpeg do the work using frag_duration
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# Fragment durations may exceed the 15% allowed variance but it seems ok
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**(
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{
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"movflags": "empty_moov+default_base_moof+frag_discont+negative_cts_offsets+skip_trailer+delay_moov",
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# Create a fragment every TARGET_PART_DURATION. The data from
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# each fragment is stored in a "Part" that can be combined with
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# the data from all the other "Part"s, plus an init section,
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# to reconstitute the data in a "Segment".
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#
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# The LL-HLS spec allows for a fragment's duration to be within
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# the range [0.85x,1.0x] of the part target duration. We use the
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# frag_duration option to tell ffmpeg to try to cut the
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# fragments when they reach frag_duration. However,
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# the resulting fragments can have variability in their
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# durations and can end up being too short or too long. With a
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# video track with no audio, the discrete nature of frames means
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# that the frame at the end of a fragment will sometimes extend
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# slightly beyond the desired frag_duration.
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#
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# If there are two tracks, as in the case of a video feed with
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# audio, there is an added wrinkle as the fragment cut seems to
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# be done on the first track that crosses the desired threshold,
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# and cutting on the audio track may also result in a shorter
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# video fragment than desired.
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#
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# Given this, our approach is to give ffmpeg a frag_duration
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# somewhere in the middle of the range, hoping that the parts
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# stay pretty well bounded, and we adjust the part durations
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# a bit in the hls metadata so that everything "looks" ok.
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"frag_duration": str(
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int(self._stream_settings.part_target_duration * 9e5)
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),
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}
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if self._stream_settings.ll_hls
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else {}
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),
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},
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)
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output_vstream = container.add_stream(template=input_vstream)
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# Check if audio is requested
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output_astream = None
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if input_astream:
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if self._audio_bsf:
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self._audio_bsf_context = self._audio_bsf.create()
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self._audio_bsf_context.set_input_stream(input_astream)
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output_astream = container.add_stream(
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template=self._audio_bsf_context or input_astream
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)
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return container, output_vstream, output_astream
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def reset(self, video_dts: int) -> None:
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"""Initialize a new stream segment."""
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self._part_start_dts = self._segment_start_dts = video_dts
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self._segment = None
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self._memory_file = BytesIO()
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self._memory_file_pos = 0
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(
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self._av_output,
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self._output_video_stream,
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self._output_audio_stream,
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) = self.make_new_av(
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memory_file=self._memory_file,
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sequence=self._stream_state.next_sequence(),
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input_vstream=self._input_video_stream,
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input_astream=self._input_audio_stream,
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)
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if self._output_video_stream.name == "hevc":
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self._output_video_stream.codec_tag = "hvc1"
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def mux_packet(self, packet: av.Packet) -> None:
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"""Mux a packet to the appropriate output stream."""
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# Check for end of segment
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if packet.stream == self._input_video_stream:
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if (
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packet.is_keyframe
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and (packet.dts - self._segment_start_dts) * packet.time_base
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>= self._stream_settings.min_segment_duration
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):
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# Flush segment (also flushes the stub part segment)
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self.flush(packet, last_part=True)
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# Mux the packet
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packet.stream = self._output_video_stream
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self._av_output.mux(packet)
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self.check_flush_part(packet)
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self._part_has_keyframe |= packet.is_keyframe
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elif packet.stream == self._input_audio_stream:
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if self._audio_bsf_context:
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self._audio_bsf_context.send(packet)
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while packet := self._audio_bsf_context.recv():
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packet.stream = self._output_audio_stream
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self._av_output.mux(packet)
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return
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packet.stream = self._output_audio_stream
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self._av_output.mux(packet)
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def create_segment(self) -> None:
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"""Create a segment when the moov is ready."""
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self._segment = Segment(
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sequence=self._stream_state.sequence,
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stream_id=self._stream_state.stream_id,
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init=read_init(self._memory_file),
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# Fetch the latest StreamOutputs, which may have changed since the
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# worker started.
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_stream_outputs=self._stream_state.outputs,
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start_time=self._start_time,
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)
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self._memory_file_pos = self._memory_file.tell()
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self._memory_file.seek(0, SEEK_END)
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def check_flush_part(self, packet: av.Packet) -> None:
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"""Check for and mark a part segment boundary and record its duration."""
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if self._memory_file_pos == self._memory_file.tell():
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return
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if self._segment is None:
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# We have our first non-zero byte position. This means the init has just
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# been written. Create a Segment and put it to the queue of each output.
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self.create_segment()
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# When using delay_moov, the moov is not written until a moof is also ready
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# Flush the moof
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self.flush(packet, last_part=False)
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else: # These are the ends of the part segments
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self.flush(packet, last_part=False)
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def flush(self, packet: av.Packet, last_part: bool) -> None:
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"""Output a part from the most recent bytes in the memory_file.
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If last_part is True, also close the segment, give it a duration,
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and clean up the av_output and memory_file.
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There are two different ways to enter this function, and when
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last_part is True, packet has not yet been muxed, while when
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last_part is False, the packet has already been muxed. However,
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in both cases, packet is the next packet and is not included in
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the Part.
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This function writes the duration metadata for the Part and
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for the Segment. However, as the fragmentation done by ffmpeg
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may result in fragment durations which fall outside the
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[0.85x,1.0x] tolerance band allowed by LL-HLS, we need to fudge
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some durations a bit by reporting them as being within that
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range.
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Note that repeated adjustments may cause drift between the part
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durations in the metadata and those in the media and result in
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playback issues in some clients.
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"""
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# Part durations should not exceed the part target duration
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adjusted_dts = min(
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packet.dts,
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self._part_start_dts
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+ self._stream_settings.part_target_duration / packet.time_base,
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)
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if last_part:
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# Closing the av_output will write the remaining buffered data to the
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# memory_file as a new moof/mdat.
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self._av_output.close()
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# With delay_moov, this may be the first time the file pointer has
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# moved, so the segment may not yet have been created
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if not self._segment:
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self.create_segment()
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elif not self._part_has_keyframe:
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# Parts which are not the last part or an independent part should
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# not have durations below 0.85 of the part target duration.
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adjusted_dts = max(
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adjusted_dts,
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self._part_start_dts
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+ 0.85 * self._stream_settings.part_target_duration / packet.time_base,
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)
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# Undo dts adjustments if we don't have ll_hls
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if not self._stream_settings.ll_hls:
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adjusted_dts = packet.dts
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assert self._segment
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self._memory_file.seek(self._memory_file_pos)
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self._hass.loop.call_soon_threadsafe(
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self._segment.async_add_part,
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Part(
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duration=float(
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(adjusted_dts - self._part_start_dts) * packet.time_base
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),
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has_keyframe=self._part_has_keyframe,
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data=self._memory_file.read(),
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),
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(
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segment_duration := float(
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(adjusted_dts - self._segment_start_dts) * packet.time_base
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)
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)
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if last_part
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else 0,
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)
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if last_part:
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# If we've written the last part, we can close the memory_file.
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self._memory_file.close() # We don't need the BytesIO object anymore
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self._start_time += datetime.timedelta(seconds=segment_duration)
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# Reinitialize
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self.reset(packet.dts)
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else:
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# For the last part, these will get set again elsewhere so we can skip
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# setting them here.
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self._memory_file_pos = self._memory_file.tell()
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self._part_start_dts = adjusted_dts
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self._part_has_keyframe = False
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def close(self) -> None:
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"""Close stream buffer."""
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self._av_output.close()
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self._memory_file.close()
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class PeekIterator(Iterator):
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"""An Iterator that may allow multiple passes.
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This may be consumed like a normal Iterator, however also supports a
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peek() method that buffers consumed items from the iterator.
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"""
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def __init__(self, iterator: Iterator[av.Packet]) -> None:
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"""Initialize PeekIterator."""
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self._iterator = iterator
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self._buffer: deque[av.Packet] = deque()
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# A pointer to either _iterator or _buffer
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self._next = self._iterator.__next__
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def __iter__(self) -> Self:
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"""Return an iterator."""
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return self
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def __next__(self) -> av.Packet:
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"""Return and consume the next item available."""
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return self._next()
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def _pop_buffer(self) -> av.Packet:
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"""Consume items from the buffer until exhausted."""
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if self._buffer:
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return self._buffer.popleft()
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# The buffer is empty, so change to consume from the iterator
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self._next = self._iterator.__next__
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return self._next()
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def peek(self) -> Generator[av.Packet, None, None]:
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"""Return items without consuming from the iterator."""
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# Items consumed are added to a buffer for future calls to __next__
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# or peek. First iterate over the buffer from previous calls to peek.
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self._next = self._pop_buffer
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for packet in self._buffer:
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yield packet
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for packet in self._iterator:
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self._buffer.append(packet)
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yield packet
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class TimestampValidator:
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"""Validate ordering of timestamps for packets in a stream."""
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def __init__(self, inv_video_time_base: int, inv_audio_time_base: int) -> None:
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"""Initialize the TimestampValidator."""
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# Decompression timestamp of last packet in each stream
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self._last_dts: dict[av.stream.Stream, int | float] = defaultdict(
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lambda: NEGATIVE_INF
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)
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# Number of consecutive missing decompression timestamps
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self._missing_dts = 0
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# For the bounds, just use the larger of the two values. If the error
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# is not flagged by one stream, it should just get flagged by the other
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# stream. Either value should result in a value which is much less than
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# a 32 bit INT_MAX, which helps avoid the assertion error from FFmpeg.
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self._max_dts_gap = MAX_TIMESTAMP_GAP * max(
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inv_video_time_base, inv_audio_time_base
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)
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def is_valid(self, packet: av.Packet) -> bool:
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"""Validate the packet timestamp based on ordering within the stream."""
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# Discard packets missing DTS. Terminate if too many are missing.
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if packet.dts is None:
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if self._missing_dts >= MAX_MISSING_DTS:
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raise StreamWorkerError(
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f"No dts in {MAX_MISSING_DTS+1} consecutive packets"
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)
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self._missing_dts += 1
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return False
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self._missing_dts = 0
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# Discard when dts is not monotonic. Terminate if gap is too wide.
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prev_dts = self._last_dts[packet.stream]
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if abs(prev_dts - packet.dts) > self._max_dts_gap and prev_dts != NEGATIVE_INF:
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raise StreamWorkerError(
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f"Timestamp discontinuity detected: last dts = {prev_dts}, dts ="
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f" {packet.dts}"
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)
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if packet.dts <= prev_dts:
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return False
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self._last_dts[packet.stream] = packet.dts
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return True
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def is_keyframe(packet: av.Packet) -> Any:
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"""Return true if the packet is a keyframe."""
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return packet.is_keyframe
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def get_audio_bitstream_filter(
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packets: Iterator[av.Packet], audio_stream: Any
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) -> av.BitStreamFilterContext | None:
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"""Return the aac_adtstoasc bitstream filter if ADTS AAC is detected."""
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if not audio_stream:
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return None
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for count, packet in enumerate(packets):
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if count >= PACKETS_TO_WAIT_FOR_AUDIO:
|
|
# Some streams declare an audio stream and never send any packets
|
|
_LOGGER.warning("Audio stream not found")
|
|
break
|
|
if packet.stream == audio_stream:
|
|
# detect ADTS AAC and disable audio
|
|
if audio_stream.codec.name == "aac" and packet.size > 2:
|
|
with memoryview(packet) as packet_view:
|
|
if packet_view[0] == 0xFF and packet_view[1] & 0xF0 == 0xF0:
|
|
_LOGGER.debug(
|
|
"ADTS AAC detected. Adding aac_adtstoaac bitstream filter"
|
|
)
|
|
return av.BitStreamFilter("aac_adtstoasc")
|
|
break
|
|
return None
|
|
|
|
|
|
def stream_worker(
|
|
source: str,
|
|
pyav_options: dict[str, str],
|
|
stream_settings: StreamSettings,
|
|
stream_state: StreamState,
|
|
keyframe_converter: KeyFrameConverter,
|
|
quit_event: Event,
|
|
) -> None:
|
|
"""Handle consuming streams."""
|
|
|
|
if av.library_versions["libavformat"][0] >= 59 and "stimeout" in pyav_options:
|
|
# the stimeout option was renamed to timeout as of ffmpeg 5.0
|
|
pyav_options["timeout"] = pyav_options["stimeout"]
|
|
del pyav_options["stimeout"]
|
|
try:
|
|
container = av.open(source, options=pyav_options, timeout=SOURCE_TIMEOUT)
|
|
except av.AVError as err:
|
|
raise StreamWorkerError(
|
|
f"Error opening stream ({err.type}, {err.strerror})"
|
|
f" {redact_credentials(str(source))}"
|
|
) from err
|
|
try:
|
|
video_stream = container.streams.video[0]
|
|
except (KeyError, IndexError) as ex:
|
|
raise StreamWorkerError("Stream has no video") from ex
|
|
keyframe_converter.create_codec_context(codec_context=video_stream.codec_context)
|
|
try:
|
|
audio_stream = container.streams.audio[0]
|
|
except (KeyError, IndexError):
|
|
audio_stream = None
|
|
if audio_stream and audio_stream.name not in AUDIO_CODECS:
|
|
audio_stream = None
|
|
# Some audio streams do not have a profile and throw errors when remuxing
|
|
if audio_stream and audio_stream.profile is None:
|
|
audio_stream = None
|
|
# Disable ll-hls for hls inputs
|
|
if container.format.name == "hls":
|
|
for field in fields(StreamSettings):
|
|
setattr(
|
|
stream_settings,
|
|
field.name,
|
|
getattr(STREAM_SETTINGS_NON_LL_HLS, field.name),
|
|
)
|
|
stream_state.diagnostics.set_value("container_format", container.format.name)
|
|
stream_state.diagnostics.set_value("video_codec", video_stream.name)
|
|
if audio_stream:
|
|
stream_state.diagnostics.set_value("audio_codec", audio_stream.name)
|
|
|
|
dts_validator = TimestampValidator(
|
|
int(1 / video_stream.time_base),
|
|
1 / audio_stream.time_base if audio_stream else 1,
|
|
)
|
|
container_packets = PeekIterator(
|
|
filter(dts_validator.is_valid, container.demux((video_stream, audio_stream)))
|
|
)
|
|
|
|
def is_video(packet: av.Packet) -> Any:
|
|
"""Return true if the packet is for the video stream."""
|
|
return packet.stream.type == "video"
|
|
|
|
# Have to work around two problems with RTSP feeds in ffmpeg
|
|
# 1 - first frame has bad pts/dts https://trac.ffmpeg.org/ticket/5018
|
|
# 2 - seeking can be problematic https://trac.ffmpeg.org/ticket/7815
|
|
#
|
|
# Use a peeking iterator to peek into the start of the stream, ensuring
|
|
# everything looks good, then go back to the start when muxing below.
|
|
try:
|
|
# Get the required bitstream filter
|
|
audio_bsf = get_audio_bitstream_filter(container_packets.peek(), audio_stream)
|
|
# Advance to the first keyframe for muxing, then rewind so the muxing
|
|
# loop below can consume.
|
|
first_keyframe = next(
|
|
filter(lambda pkt: is_keyframe(pkt) and is_video(pkt), container_packets)
|
|
)
|
|
# Deal with problem #1 above (bad first packet pts/dts) by recalculating
|
|
# using pts/dts from second packet. Use the peek iterator to advance
|
|
# without consuming from container_packets. Skip over the first keyframe
|
|
# then use the duration from the second video packet to adjust dts.
|
|
next_video_packet = next(filter(is_video, container_packets.peek()))
|
|
# Since the is_valid filter has already been applied before the following
|
|
# adjustment, it does not filter out the case where the duration below is
|
|
# 0 and both the first_keyframe and next_video_packet end up with the same
|
|
# dts. Use "or 1" to deal with this.
|
|
start_dts = next_video_packet.dts - (next_video_packet.duration or 1)
|
|
first_keyframe.dts = first_keyframe.pts = start_dts
|
|
except StreamWorkerError as ex:
|
|
container.close()
|
|
raise ex
|
|
except StopIteration as ex:
|
|
container.close()
|
|
raise StreamEndedError("Stream ended; no additional packets") from ex
|
|
except av.AVError as ex:
|
|
container.close()
|
|
raise StreamWorkerError(
|
|
"Error demuxing stream while finding first packet: %s" % str(ex)
|
|
) from ex
|
|
|
|
muxer = StreamMuxer(
|
|
stream_state.hass,
|
|
video_stream,
|
|
audio_stream,
|
|
audio_bsf,
|
|
stream_state,
|
|
stream_settings,
|
|
)
|
|
muxer.reset(start_dts)
|
|
|
|
# Mux the first keyframe, then proceed through the rest of the packets
|
|
muxer.mux_packet(first_keyframe)
|
|
|
|
with contextlib.closing(container), contextlib.closing(muxer):
|
|
while not quit_event.is_set():
|
|
try:
|
|
packet = next(container_packets)
|
|
except StreamWorkerError as ex:
|
|
raise ex
|
|
except StopIteration as ex:
|
|
raise StreamEndedError("Stream ended; no additional packets") from ex
|
|
except av.AVError as ex:
|
|
raise StreamWorkerError("Error demuxing stream: %s" % str(ex)) from ex
|
|
|
|
muxer.mux_packet(packet)
|
|
|
|
if packet.is_keyframe and is_video(packet):
|
|
keyframe_converter.stash_keyframe_packet(packet)
|